Entelis, S.G.
John Wiley & Sons, 1976
Buku Teks
Popovych, Orest
John Wiley & Sons, 1981
Buku Teks
Blom, Leendert
Joh Luuk, [date of publication not identified]
Buku Teks
Beiser, Arthur
McGraw-Hill, 1964
Buku Teks
Berry, R. Stephen
John Wiley & Sons, 1980
Buku Teks